Manual de pH Metro

inoLabpH 730ba

7544

3e

Operating Manual

Laboratory pH meter

pH

730

ba75443e02 06/2004

Accuracy whengoing to press

The use of advanced technology and the high quality stan-dard of our instruments are the result of continuous develop-ment. This may result in differences between this operating manual and your instrument. We cannot guarantee that there are absolutely no errors in this manual. We are sure you will understand that we cannot accept any legal claims resulting from the data, figures or descriptions.

Warrantydeclaration

The designated instrument is covered by a warranty of three years from the date of purchase. The instrument warranty extends to manufacturing faults that are determined within the period of warranty. The warranty excludes components that are replaced during maintenance such as batteries, etc.

The warranty claim extends to restoring the instrument to readiness for use but not, however, to any further claim for damages. Improper handling or unauthorized opening of the instrument invalidates any warranty claim.

To ascertain the warranty liability, return the instrument and proof of purchase together with the date of purchase freight paid or prepaid.

Copyright © Weilheim 2004, WTW GmbHReprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim.Printed in Germany.

pH 730 Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.1 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.3 Sockets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.2 General safety instructions. . . . . . . . . . . . . . . . 10

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . 133.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . 13

3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . 13

4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154.1 Switch on the instrument . . . . . . . . . . . . . . . . . 154.2 Measuring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2.1 Measuring the pH value . . . . . . . . . . . . 184.2.2 Measuring the Redox voltage . . . . . . . . 194.2.3 Printing/transmitting measured values . 20

4.3 Calibrating . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.3.1 Calibration interval (Int 3) . . . . . . . . . . . 244.3.2 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . 254.3.3 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . 284.3.4 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.4 Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344.4.1 Manual storage . . . . . . . . . . . . . . . . . . . 344.4.2 Switching on AutoStore (Int 1). . . . . . . . 364.4.3 Outputting the data storage. . . . . . . . . . 384.4.4 Clearing the storage . . . . . . . . . . . . . . . 41

4.5 Data transmission. . . . . . . . . . . . . . . . . . . . . . . 424.5.1 Data transmission interval (Int 2). . . . . . 424.5.2 Recorder (analog output) . . . . . . . . . . . 444.5.3 PC/external printer (RS232 interface) . . 454.5.4 Operation with MultiLab pilot . . . . . . . . . 46

4.6 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 474.7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

3

Contents pH 730

5 Maintenance, cleaning, disposal. . . . . . . . . . . 535.1 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . 53

5.1.1 Changing the batteries . . . . . . . . . . . . . 545.1.2 Replacing the roll of printer paper . . . . 55

5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . 57

7 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . 61

8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

4

pH 730 Overview

1 Overview

The compact inoLab pH 730 precision pH meter lets you perform pH measurements rapidly and reliably. The inoLab pH 730 provides the highest degree of operating comfort, reliability and measuring safety for all applications.

The integrated printer* enables the measurements to be documented in compliance with GLP. The proven MultiCal® calibration procedures andspecial AutoRead function support your work with the pH meter.

NoteThe measuring instrument can also be delivered as part of a set. Information on this and other accessories is available in the WTW catalog LABORATORY AND FIELD INSTRUMENTATION or via the Internet.

* only on the pH 730 with integrated printer

1 Keypad

2 Display

3 Sockets

4 Printer

pH

730

3

2

1

4

5

Overview pH 730

1.1 Keyboard

*

1 Paper feed/line feed *(Printer off - Print LED lights up red)

2 Printer ON/OFF *

3 Print LED *Red: printer off (offline) or malfunctionGreen: printer ready for operation (online)

4 Call up calibration procedure

5 Select measuring mode

6 Display or transmit measured values

7 Measuring instrument ON/OFF

8 Activate/deactivate AutoRead function

9 Store measured value

10 Increase values, scroll

11 Confirm inputs, start AutoRead

12 Reduce values, scroll


1

2

3

4

9

10

11

5

6

7

8

12

6

pH 730 Overview

1.2 Display

1.3 Sockets

CautionOnly connect electrodes to the instrument that cannot feed excessive voltages or currents (> SELV and > circuit with current limiter). Almost all commercial electrodes - especial-ly WTW electrodes - meet these requirements.

Connectors:

1 pH electrode

2 Temperature probe

3 Reference electrode

4 RS 232 interface / analog output

5 Plug-in power supply

Status line

Measured value display

Function and temperature display

Sensor symbol

1 2

34

5

7

Overview pH 730

8

pH 730 Safety

2 Safety

This operating manual contains basic instructions that you must follow during the commissioning, operation and main-tenance of the instrument. Consequently, all responsible personnel must read this operating manual before working with the instrument. The operating manual must always be available within the vicinity of the instrument.

Target group This measuring instrument was developed for use in the lab-oratory. Thus, we assume that, as a result of their professional train-ing and experience, the operators will know the necessary safety precautions to take when handling chemicals.

Symbols used

Cautionindicates instructions that have to be followed to prevent damage to your instrument.

Warningindicates instructions that have to be followed to protect yourself and the instrument from dangerous electrical volt-age.

NoteIndicates notes that draw your attention to special features.

NoteIndicates cross-references to other documents, e.g. appli-cation reports, operating manuals of combination elec-trodes, etc.

9

Safety pH 730

2.1 Authorized useThis instrument is authorized exclusively for pH and Redox measurements in the laboratory. The technical specifications as given in chapter 7 TECHNICAL DATA, must be observed. Only the operation and running of the measuring instrument according to the instructions given in this operating manual is authorized.Any other use is considered unauthorized.

2.2 General safety instructionsThis instrument is constructed and tested in compliance with the IEC 1010 safety regulations for electronic measuring in-struments. It left the factory in a safe and secure technical condition.

Function and opera-tional safety

The smooth functioning and operational safety of the instru-ment can only be guaranteed if the generally applicable safety measures and the specific safety instructions in this operating manual are followed.

The smooth functioning and operational safety of the instru-ment can only be guaranteed under the climatic conditions specified in chapter 7 TECHNICAL DATA.

If the instrument was transported from a cold environment to a warm environment, the formation of condensate can lead to the faulty functioning of the instrument. In this event, wait until the temperature of the instrument reaches room tem-perature before putting the instrument back into operation.

CautionThe instrument is only allowed to be opened by personnel authorized by WTW.

10

pH 730 Safety

Safe operation If safe operation is no longer possible, the instrument must be taken out of service and secured against inadvertent op-eration.Safe operation is no longer possible if:

� the instrument has been damaged in transport

� the instrument has been stored under adverse conditions for a lengthy period of time

� the instrument is visibly damaged

� the instrument no longer operates as described in this manual.

If you are in doubt contact the supplier of the instrument.

Obligations of theoperator

The operator of this measuring instrument must ensure that the following laws and guidelines are observed when using dangerous substances:

� EEC directives for protective labor legislation

� National protective labor legislation

� Safety regulations

� Safety datasheets of the chemical manufacturer

11

Safety pH 730

12

pH 730 Commissioning

3 Commissioning

3.1 Scope of delivery� Laboratory measuring instrument, inoLab pH 730

� Plug-in power supply

� Operating manual and short manual

� 4 x type AA Mignon 1.5 V batteries

3.2 Initial commissioningPerform the following activities:

� Set the date and time

� Connect the plug-in power supply (for printer functions).

1 Press and hold down the m key.

2 Press the e key.The Display test appears briefly on the display.The measuring instrument then switches automati-cally to the setting of the baud rate.

3 Press the g key repeatedly until the date flashes on the display.

4 Set today’s date by pressing 82.

5 Confirm with g.The date (month) flashes on the display.

6 Set the current month by pressing 82.

7 Confirm with g. The year appears on the display.

8 Set the current year by pressing 82.

9 Confirm with g. The hour field flashes on the dis-play.

10 Set the current time by pressing 82.

11 Confirm with g. The minutes field flashes on the display.


Setting the dateand time

13

Commissioning pH 730

Connecting theplug-in power

supply

The measuring instrument works battery-powered. It can, however, also be supplied by the plug-in power supply which is available as an accessory.

WarningThe line voltage on site must lie within the input voltage range of the original plug-in power supply unit (see chapter 7 TECHNICAL DATA).

CautionUse original plug-in power supplies only (see chapter 7 TECHNICAL DATA).

NoteYou can also perform measurements without a plug-in pow-er supply. However, the functions of the integrated printer can only be used with connected plug-in power supply.

13 Confirm with g. The measuring instrument then switches to the pH measuring mode.

14 Switch off the instrument by pressing e.

1 Insert the plug (1) into the socket (2) of the pH meter.

2 Connect the original WTW plug-in power supply (3) to an easily accessible mains socket.

1

2

3

14

pH 730 Operation

4 Operation

4.1 Switch on the instrument

NoteThe instrument has an energy saving feature to avoid unnecessary battery depletion. The energy saving feature switches the instrument off if no key has been pressed for an hour.The energy saving feature is not active:

� if the power is supplied by the plug-in power supply

� if the AutoStore function is active

� if the communication cable is connected

� if the recorder cable is connected

� if the printer cable is connected(for external printers)

1 Place the instrument on a flat surface and protect it against intense light and heat.

2 Press the e key.The Display test appears briefly on the display.The instrument then switches automatically to the previously selected measuring mode.

15

Operation pH 730

4.2 MeasuringPreparatory

activitiesPerform the following preparatory activities when you want to measure:

NoteIncorrect calibration of the pH electrode will result in incor-rect measured values. Therefore, regularly perform calibra-tion before measuring.

CautionWhen connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.The RS232 interface is not galvanically isolated.

1 Connect the electrode to the instrument.

2 Adjust the temperature of the buffer or test solutions or measure the current temperature if the measure-ment is made without a temperature probe.

3 Calibrate or check the instrument with the electrode.

4 Select the measuring mode by pressing m.

16

pH 730 Operation

Temperature probe Measurements can be performed with and without a temper-ature probe. A connected temperature probe is indicated by TP on the display.

NoteThe pH meter automatically recognizes the type of the tem-perature probe used. As a result, you can connect elec-trodes with the NTC30 or Pt1000.

The temperature measurement is absolutely essential for a reproducible pH measurement. If the measurement is made without a temperature probe, proceed as follows:

NoteWhen calibrating without a temperature probe, set up the current temperature of the respective buffer solution manu-ally by pressing the 82 keys.

1 Determine the current temperature using a thermo-meter.

2 Set up the temperature by pressing 82.

17

Operation pH 730

4.2.1 Measuring the pH value

AutoRead AR(Drift control)

The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured values.

For identical measurement conditions, the following criteria apply:� pH value: better than 0.02 (response time: > 30 s)

1 Perform the preparatory activities according to sec-tion 4.2.

2 Immerse the pH electrode into the test sample.

3 Press the m key until pH appears in the status dis-play. The pH value appears on the display.

1 Call up the pH measuring mode by pressing m.

2 Activate the AutoRead function by pressing a.The current measured value is frozen (Hold function).

3 Start the AutoRead function by pressing g.AR flashes on the display until a stable measured val-ue is reached. This measured value is transmitted to a printer/inter-face.

4 If necessary, start the next AutoRead measurement by pressing g.

5 To cancel the AutoRead function: Press the a key.

18

pH 730 Operation

NoteThe current AutoRead measurement (with acceptance of the current value) can be terminated at any time by pressing g.

4.2.2 Measuring the Redox voltage

The instrument can measure the Redox voltage (mV) of a solution when connected with a Redox electrode, e.g. Sen-Tix ORP.

NoteRedox electrodes are not calibrated. However, you can check Redox electrodes using a test solution.

1 Perform the preparatory activities according to sec-tion 4.2.

2 Immerse the Redox electrode into the test sample.

3 Press the m key repeatedly until U appears in the status line. The Redox voltage (mV) of the sample appears on the display.

4 Wait for a stable measured value.

19

Operation pH 730

4.2.3 Printing/transmitting measured values

Measured values (data records) can be:

� printed on the integrated printer* or

� transmitted to the interface.

NoteTo print, you must switch on the printer using the Print key o (Print LED lights up green)*. To transmit to the interface, you must connect the interface cable. The integrated printer is then switched off automati-cally.

You can print measured values (data records) in 3 ways:

� Switch on the data transmission (Int 2) (see Seite 42)

– After expiry of the selected interval, the current data record is sent to the printer/interface.

� Switch on AutoStore (Int 1) (see Seite 36)

– After expiry of the selected interval, the current data record is sent to the printer/interface and in addition is stored in the data store of the instrument

– AutoStore (Int 1) covers the data transmission interval (Int 2).

� Press the g keyThis manually triggers a printout of the current measured values at any time - independently of the selected inter-vals.

NoteIf you connect a recorder (analog output), both the output to the integrated printer and the digital output are switched off.


20

pH 730 Operation

4.3 CalibratingWhy calibrate? pH electrodes age. This changes the asymmetry (zero

point) and slope of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the asymmetry and slope of the electrode and they are stored in the instrument. Thus, you should calibrate at regular intervals.

When to calibrate? � After connecting another electrode

� When the sensor symbol flashes:

– after expiry of the calibration interval

– after a voltage interruption, e.g. battery change

Calibration points Calibration can be performed using one, two or three buffer solutions (single point calibration, two-point calibration and three-point calibration). In three-point calibration, two sepa-rate asymmetry and slope values (ASY1/S1 and ASY2/S2) are determined for the two ranges between the three buff-ers. For measuring, the calibration values relevant for the respective range are used.

You can choose between 3 calibration procedures:

AutoCal TEC Is specially adapted to the WTW technical buffer solutions as a fully automatic two or three-point calibration. The buffer solutions are automatically recognized by the instrument.

AutoCal DIN Is specially adapted to permanently programmed buffer solutions according to DIN 19266 as a fully automatic two or three-point calibration. The buffer solutions are automati-cally recognized by the instrument.

ConCal Is the conventional two-point calibration with 2 freely selectable buffer solutions or single-point calibration as the rapid method.

21

Operation pH 730

AutoRead In calibration using AutoCal TEC and AutoCal DIN, the AutoRead function is automatically activated. The current AutoRead measurement (with acceptance of the current value) can be terminated at any time by pressing g.

Calibration protocol The calibration protocol contains the calibration data of the current calibration. You can call up the calibration protocol by outputting the data storage (section 4.3.2).

NoteYou can automatically print out a calibration protocol after the calibration. To do so, switch on the printer before the cal-ibration (Print LED lights up green)*. After a valid calibration, the protocol is printed.

Sample printout:


CALIBRATION PROTOCOL 02.03.99 14:19Device No.: 12345678CALIBRATION pHCal Time: 01.03.99 / 15:20Cal Interval: 7dAutoCal DIN TautoBuffer 1 1.679Buffer 2 4.008 *Buffer 3 6.865Buffer 4 9.180 *C1 174.1mV 25.0°CC2 -133.3mV 25.0°CS1 -59.4 mV/pHASY1 - 4 mV Probe: +++

22

pH 730 Operation

Calibrationevaluation

After the calibration, the instrument automatically evaluates the current status. The asymmetry and slope are separately evaluated. The worst evaluation appears on the display.

Display Asymmetry [mV]

Slope [mV/pH]

-15 ... +15 -60.5 ... -58

-20 ... +20 -58 ... -57

-25 ... +25 -61 ... -60.5 or -57 ... -56

Clean the electrode according to the sensor operating manual

-30 ... +30 -62 ... -61or -56 ... -50

E3

Clear the fault according to chapter 6 WHAT TO DO IF...

< -30 or > 30

< -62 or > -50

1 Switch on the instrument by pressing e.

2 Connect the pH electrode to the instrument.

3 Keep the buffer solutions ready.

4 Adjust the temperature of the solutions and measure the current temperature if the measurement is per-formed without a temperature probe.

Preparatoryactivities

23

Operation pH 730

4.3.1 Calibration interval (Int 3)

The flashing sensor symbol reminds you to calibrate regu-larly. After the selected calibration interval (Int 3) expires, the sensor symbol flashes. Measurements can continue.

NoteTo ensure the high measuring precision of the measuring system, perform a calibration after the calibration interval expires.

Setting thecalibration

The calibration interval (Int 3) is set to 7 days in the factory. The interval can be changed (1 ... 999 days):

1 Switch off the instrument.

2 Press m and hold down the key.

3 Press the e key.The display test appears briefly on the display.The instrument then switches automatically to the configuration level.

4 Press the g key until Int 3 appears on the display.

5 Press 82 to set the required time interval until the next calibration.

6 Confirm with g.

7 Change to the measuring mode by pressing m.

24

pH 730 Operation

4.3.2 AutoCal TEC

Use any two or three of the WTW technical buffer solutions for this procedure in increasing or decreasing order (pH 2.00, 4.01, 7.00, or 10.00).

NoteThe calibration for pH 10.01 is optimized for the WTW tech-nical buffer solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an erroneous calibration. The correct buffer solutions are given in the WTW catalog or in the Internet.

NoteSteps 2, 6 and 13 are not required if you use a temperature probe.

1 Press the c key repeatedly until the AutoCal TEC function display appears.

2 If necessary, set the temperature of the buffer solu-tion by pressing 82.

3 Submerse the pH electrode in the first buffer solution.

4 Press the g key.AR flashes on the display.The electrode voltage (mV) appears on the display. As soon as a stable value is recognized, Ct2 ap-pears.

25

Operation pH 730

NoteIf the slope (SLO) is indicated on the display, you can change the unit of the slope with 82. The display in % refers to the Nernst slope, 59.2 mV/pH (100 x the slope determined/Nernst slope).

5 Thoroughly rinse the electrode with distilled water.

6 If necessary, set the temperature of the second buffer solution by pressing 82.

7 Submerse the electrode in the second buffer solution.

8 Press the g key.AR flashes on the display. The electrode voltage (mV) appears on the display. As soon as a stable value is recognized, AR disap-pears. The sensor symbol shows the electrode evaluation after the two-point calibration. The value of the slope (mV/pH) appears on the dis-play.

9 Press the g key.The value of the asymmetry (mV) appears on the dis-play.

10 To return to the measuring mode: Press the m key or continue with three-point calibration.

26

pH 730 Operation

NoteYou can also prematurely terminate the three-point calibra-tion by pressing m. The values of the two-point calibration for the slope and asymmetry are then stored.

11 Press the g key.Ct3 appears on the display.


13 If necessary, set the temperature of the third buffer solution by pressing 82.

14 Submerse the electrode in the third buffer solution.

15 Press the g key.AR flashes on the display.The electrode voltage (mV) appears on the display. As soon as a stable value is recognized, AR disap-pears. The sensor symbol shows the electrode evaluation after the three-point calibration. The value of the slope (mV/pH) appears on the dis-play.


17 To return to the measuring mode: Press the m key.

Three-point calibration

27

Operation pH 730

4.3.3 AutoCal DIN

Use two or three different DIN buffer solutions (type A, C, D or F with the pH values 1.679, 4.006, 6.865, 9.180) for this procedure in increasing or decreasing order.

NoteSteps 2, 6 and 13 are not required if you use a temperature probe.

1 Press the c key repeatedly until the AutoCal DIN function display appears.


3 Submerse the pH electrode in the first buffer solution.

4 Press the g key.AR flashes on the display.The electrode voltage (mV) appears on the display. As soon as a stable value is recognized, Cd2 ap-pears.

28

pH 730 Operation





8 Press the g key.AR flashes on the display. The electrode voltage (mV) appears on the display. As soon as a stable value is recognized, AR disap-pears.The sensor symbol shows the electrode evaluation after the two-point calibration. The value of the slope (mV/pH) appears on the dis-play.


10 To return to the measuring mode: Press the m key or continue with three-point calibration.

29

Operation pH 730

NoteYou can also prematurely terminate the three-point calibra-tion by pressing m. The values of the two-point calibration for slope and asymmetry are retained.

11 Press the g key.Cd3 appears on the display.


13 If necessary, set the temperature of the third buffer solution by pressing 82.

14 Submerse the electrode in the third buffer solution.

15 Press the g key.AR flashes on the display.The electrode voltage (mV) appears on the display. As soon as a stable value is recognized, AR disap-pears.The sensor symbol shows the electrode evaluation after the three-point calibration. The value of the slope (mV/pH) appears on the dis-play.

16 Press the g key.The value of the asymmetry appears on the display (mV).


Three-point calibration

30

pH 730 Operation

4.3.4 ConCal

Two-point calibration

Use two buffer solutions for this procedure:

� pH 7.0 ± 0.5

� any other buffer solution

NoteSteps 2 and 9 are not required if you use a temperature probe.

1 Press the c key repeatedly until the ConCal func-tion display appears.


3 Submerse the pH electrode in the first buffer solution pH 7.0 ± 0.5.

4 Press the g key.The measured pH value appears on the display.

5 Set the nominal pH value of the buffer solution (at the current temperature) by pressing the 82 keys.

6 Press the g key.The value of the asymmetry (mV) and the sensor symbol appear on the display.

7 Press the g key.SLO(pe) appears on the display.

31

Operation pH 730





11 Press the g key.The second measured pH value appears on the dis-play.

12 Set the nominal pH value of the second buffer solu-tion (at the current temperature).

13 Press the g key.The value of the slope (mV/pH) appears on the dis-play. The sensor symbol shows the evaluation of the elec-trode after the two-point calibration.



32

pH 730 Operation

Single-point calibration

Use any buffer solution for this rapid method. The calibration will be the more exact the nearer the pH value of the buffer solution is to that of the test sample.

NoteOnly the electrode asymmetry is determined in single-point calibration. The slope of the last two-point calibration is retained.

NoteStep 2 is not required if you use a temperature probe. The TP message indicates an active temperature measurement.

1 Press the c key repeatedly until the ConCal func-tion display appears.

2 Set the temperature of the buffer solution by pressing 82.

3 Submerse the pH electrode in the buffer solution.

4 Press the g key.The measured pH value appears on the display.

5 Set the nominal pH value of the buffer solution (at the current temperature) by pressing the 82 keys.

6 Press the g key.The value of the asymmetry (mV) and the sensor symbol for the evaluation of the electrode appears on the display.


33

Operation pH 730

4.4 StoringThe pH meter has an internal data storage device. Up to 800 data records can be stored in it. A complete data record consists of:

� Memory location

� Date/time

� Measured value

� Temperature

� Temperature measurement procedure

� I.D. number

You can transmit measured values (data records) to thedata storage in 2 ways:

� Manual storage

� Switching on the AutoStore function (Int 1).

4.4.1 Manual storage

You can transmit a measured value to the data storage as follows:

1 Press the s key.The current number of the next free memory location appears on the display.

34

pH 730 Operation

StoFullStoFullStoFullStoFull message This message appears if all 800 memory locations are full.

You have the following options:

2 Confirm with g.The display changes to the input of the I.D. number.

3 Enter the required I.D. number (1 ... 999) by pressing 82.

4 Confirm with g.The instrument changes to the measuring mode.

Store the current measured value. The oldest measured value (memory location 1) is overwritten by this

Press g

Return to the measuring mode without storing

Press any key

Output the data storage See section 4.4.3

Delete the data storage See section 4.4.4

35

Operation pH 730

4.4.2 Switching on AutoStore (Int 1)

The storage interval (Int 1) determines the time interval between automatic storage processes. After the time interval expires, the current data record is transmitted to the data storage and to the printer/interface.

Setting the storageinterval

The storage interval (Int 1) is set to OFF in the factory. Thus, the AutoStore function is switched off. To switch the function on, set up a time interval (5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min):

1 Press and hold down the g key.

2 Press the s key. Int 1 appears on the display.

3 Press the 82 keys to set up the required time in-terval between storage processes.

4 Confirm with g.The number of free memory locations appears on the display.

36

pH 730 Operation

NoteThe AutoStore function is interrupted if you perform other functions, e.g. output data storage. After completing the other function, the AutoStore function continues. However, as a result, gaps can occur in the recording of the measured values.

Switching off theAutoStore

Switch off the AutoStore function by:

� Setting the storage interval (Int 1) to OFF or

� Switch the pH meter off and on again.

5 As soon as all 800 memory locations are full, the AutoStore function is terminated (Int 1 = OFF). If too few storage locations are available for your measurements:

– backup the data storage (see Seite 38) and

– clear the data stored (see Seite 41).

6 Confirm with g.The prompt for the I.D. number appears on the dis-play.

7 Press 82 to set the required I.D. number.

8 Confirm with g.The instrument changes to the pH measuring mode and starts the measuring and storage procedure.AutoStore flashes on the display.

37

Operation pH 730

4.4.3 Outputting the data storage

The contents of the data storage can be output to the:

� display

� printer/interface

You can perform the following activities:

NoteIf you want to find a specific parameter (e.g. date), proceed as follows:

1 Press the r key repeatedly until Sto disp appears on the display.

2 Press the g key. A measured value appears on the display. The memory location of the data store appears for approx. 2 s. This is followed by the corresponding temperature.

Display further parameters of the data record (I.D. no., date, time, memory location)

Press g

Advance one data record (memory location) Press 8

Go back one data record (memory location) Press 2

Outputting to thedisplay

38

pH 730 Operation

NoteYou can the cancel the transmission by pressing m or g.

1 Select the parameter (e.g. date) by pressing g.

2 Press 8 or 2 repeatedly until the required date appears on the display.After approx. 2 s, the temperature of the displayed measured value appears.

1 Press the r key repeatedly until Sto SEr appears on the display.

2 Press the g key. Sto CAL appears on the display. The calibration pro-tocol is transmitted to the printer/interface. Following the calibration protocol, the complete con-tents of the storage is transmitted to the printer/inter-face.

Outputting toprinter/interface

39

Operation pH 730

Sample printout:

The printout contains:

� calibration protocol

� storage contents

CALIBRATION PROTOCOL 02.03.99 14:19Device No.: 12345678CALIBRATION pHCal Time: 01.03.99 / 15:20Cal Interval: 7dAutoCal DIN TautoBuffer 1 1.679Buffer 2 4.008 *Buffer 3 6.865Buffer 4 9.180 *C1 174.1mV 25.0°CC2 -133.3mV 25.0°CS1 -59.4 mV/pHASY1 - 4 mV Probe: +++

No. 1: 09.03.99 17:10pH 10.01 25 °CTman ARIdent : 1

No. 2: 09.03.99 17:11pH 10.01 24,7 °CTauto ARIdent : 1

No. 3: 09.03.99 17:12 305 mV TautoIdent : 13

40

pH 730 Operation

4.4.4 Clearing the storage

This function can erase the stored data records. 800 mem-ory locations will then become available again.

NoteThe Clear store function only appears if data records have already been stored in the storage. Otherwise, the pH meter automatically changes to the measuring mode.

In order to delete all the data records, proceed as follows:

NoteThe calibration data remain in the storage and can be called up via the calibration protocol.


2 Press and hold down the s key.

3 Press the e key.The display test appears briefly on the display.

4 Confirm the clearing process by pressing g.Pressing any other key stops the clearing process and the data records remain in the storage.

41

Operation pH 730

4.5 Data transmissionYou can use the following options to transmit data:

� One of the following options:

– The AutoStore function (Seite 36) is used to periodically ( Int 1 storage interval) save measured values internally and output them on the printer/interface.

– The data transmission interval (Int 2) function is used to periodically output measured values to a printer/interface (see below).

� The Output data store function (Seite 38) is used to out-put calibration data and stored measured values to a printer/interface.

� The analog recorder output (Seite 44) is used to output measured values as voltages.

4.5.1 Data transmission interval (Int 2)

The interval for the data transmission (Int 2) is determined by the time interval between automatic data transmissions. After the time interval expires, the current data record is transmitted to the interface.

NoteThe setting of the interval (Int 2) only has an effect when the storage interval (AutoStore function) is switched off.

42

pH 730 Operation

Setting thedata transmission

interval

The interval is set to OFF in the factory. To start the data transmission, set up an interval (5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min):

NoteIf the AutoStore function is active, the data transmission is performed according to the setting of the storage interval (Int 1). Set the storage interval (Int 1) to OFF to activate the data transmission interval (Int 2).

NoteYou can also set the data transmission interval (Int 2) in the Configuration menu (see Seite 47).


2 Press the a key.Int 2 appears on the display.

3 Press 82 to set up the required time interval be-tween storage processes.

4 Confirm with g. The instrument changes automatically to the pH measuring mode.

43

Operation pH 730

4.5.2 Recorder (analog output)

You can transmit the data to a recorder via the analog out-put. Connect the analog output to the recorder via the AK323 interface cable. The data output switches automatically to recorder output.

NoteActivate the analog output by connecting 2 and 3.

Socket assignment1 Free2 Plug coding3 Ground4 Analog output

low impedance electrode signalcorresponds to 50 ... 62 mV/pH(internal resistance < 5 Ohm)

1 2

34

RS 232REC

44

pH 730 Operation

4.5.3 PC/external printer (RS232 interface)

You can transmit data to a PC or an external printer via the RS232 interface. Connect the interface to the instrument via the AK340/B cable (PC) or AK325/S cable (external printer). The data output switches automatically to RS232.

NoteThe RS232 interface is not galvanically isolated. If it is connected to an earthed PC/printer, measurements cannot be made in earthed media as this would give incor-rect results!

Set up the following transmission data on the PC/printer:

Baud rate Selectable between: 1200, 2400, 4800, 9600

Handshake RTS/CTS + Xon/Xoff

PC only:

Parity None

Data bits 8

Stop bits 1

Socket assignment1 CTS2 RxD3 Ground4 TxD

1 2

34

RS 232REC

45

Operation pH 730

4.5.4 Operation with MultiLab pilot

With the aid of the MultiLab pilot software, you can record and evaluate measuring data with a PC. The data is trans-mitted after the measuring instrument is connected to the RS232 serial interface (COM interface) of a PC.

NoteMore detailed information can be found in the MultiLab pilot operating manual.

46

pH 730 Operation

4.6 ConfigurationYou can adapt the pH meter to your individual requirements. To do this, the following parameters can be changed (the status on delivery is marked in bold):

NoteYou can leave the configuration menu at any time. Parame-ters that have already been changed are stored. To do this, press the m key.

Baud rate 1200, 2400, 4800, 9600

Data transmission inter-val (Int 2)

OFF, 5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min

Calibration interval (Int 3)1 ... 7 ... 999 d

Temperature unit °C, °F

Date/time As required

Resolution of pH display 0.01, 0.001


2 Press and hold down the m key.

3 Press the e key.The display test appears briefly on the display.The instrument then switches automatically to the setting of the baud rate.

47

Operation pH 730

4 Set up the required baud rate by pressing 82.

5 Confirm with g.Int 2 appears on the display.

6 Set up the required time interval by pressing 82.

7 Confirm with g.Int 3 appears on the display.

8 Set up the required time interval by pressing 82.

9 Confirm with g.USE °C appears on the display.

Baud rate

Data transmissioninterval

Calibrationinterval

48

pH 730 Operation

10 Change between °C and °F by pressing 82.

11 Confirm with g.The date flashes on the display.

Temperature unit

12 Set today’s date by pressing 82.

13 Confirm with g.The date (month) flashes on the display.

14 Set the current month by pressing 82.

15 Confirm with g.The year appears on the display.

16 Set the current year by pressing 82.

17 Confirm with g.The hours flash on the display.


19 Confirm with g.The minutes flash on the screen.


Date and time

49

Operation pH 730

21 Confirm with g.The instrument changes automatically to the pH measuring mode.


2 Press the m key.The measured values appear with the higher resolution on the display, e.g. pH = 4.012.

3 Press the g key and m key again.The measured values with the lower resolution appear on the display, e.g. pH = 4.01.

Adjusting theresolution

50

pH 730 Operation

4.7 ResetYou can reset (initialize) measuring and configuration parameters separately from one another.

Measuringparameters

The following measuring parameters (pH InI) are reset to the values they had on delivery:

NoteWhen the measuring parameters are reset, the calibration data are lost. After the parameters have been reset, cali-brate!

Configurationparameters

The following configuration parameters (InI) are reset to the values they had on delivery:

Measuring mode pH

Asymmetry 0 mV

Slope -59.16 mV/pH

Calibration procedure AutoCal TEC

Temperature, manual 25°C

Resolution of pH display 0.01

Baud rate 4800

Interval 1(automatic storing) OFF

Interval 2(for data transmission) OFF

51

Operation pH 730


2 Press the c key.

3 Use 82 to toggle between no and yes.yes: reset measuring parameters.no: retain settings.

4 Confirm with g.The instrument changes to the configuration para-meters.

5 Toggle between no and yes by pressing 82.yes: reset configuration parameters.no: retain settings.

6 Confirm with g.The instrument changes automatically to the pH measuring mode.

Resettingmeasuring

parameters

Resettingconfiguration

parameters

52

pH 730 Maintenance, cleaning, disposal

5 Maintenance, cleaning, disposal

5.1 MaintenanceThe maintenance tasks are restricted to the following activi-ties:

� replacing the batteries and

� replacing the roll of printer paper*.

NoteSee the relevant operating manual of the electrode for in-structions on maintenance.


53

Maintenance, cleaning, disposal pH 730

5.1.1 Changing the batteries

CautionMake sure that the poles of the batteries are the right way round.The ± signs in the battery compartment must correspond to the ± signs on the batteries. Only use leakproof alkaline manganese batteries.

1 Open the battery compartment (1) on the underside of the instrument.

2 Remove the four batteries from the battery compart-ment.

3 Insert four new batteries (Type Mignon AA) into the battery compartment.

4 Close the battery compartment (1).The date (day) flashes on the display.

5 Set up the date and time according to section 3.2.

1

54

pH 730 Maintenance, cleaning, disposal

5.1.2 Replacing the roll of printer paper *

NoteOnly use original WTW rolls of printer paper. Information on this is given in the WTW catalog, LABORATORY AND FIELD IN-STRUMENTATION or via the Internet.You can also use HQ thermal paper that remains legible for at least 10 years.


1 Switch off the printer (Print LED lights up red).

2 Open the lid of the printer (1).

3 Remove the empty roll of paper (2).

4 Insert the new roll of paper:

– Fold the leading edge of the paper inwards and thread it into the printer (3) from underneath.

– Press the f Print key (paper feed)

5 Close the lid of the printer (1).

1

2

3

55

Maintenance, cleaning, disposal pH 730

5.2 CleaningOccasionally wipe the outside of the measuring instrument with a damp, lint-free cloth. Disinfect the housing with iso-propanol as required.

CautionThe housing is made of synthetic material (ABS). Thus, avoid contact with acetone or similar detergents that contain solvents. Remove any splashes immediately.

5.3 DisposalPacking The measuring instrument is sent out in a protective trans-

port packing. We recommend: Keep the packing material. It protects the instrument against damage during transport.

Batteries This note refers to the battery regulation that applies in the Federal Republic of Germany. We would ask end-consum-ers in other countries to follow their local statutory provi-sions.

NoteIn compliance with §14 of the BATTERY REGULATION, we would like to point out that this instrument contains batteries. Batteries that have been removed must only be disposed of at the recycling facility set up for this purpose or via the retail outlet. It is illegal to dispose of them in household refuse.

Measuringinstrument

Dispose of the measuring instrument as electronic waste at an appropriate collection point. It is illegal to dispose of them in household refuse.

56

pH 730 What to do if...

6 What to do if...

Cause Remedy

pH electrode:

– Not connected – Connect electrode

– Air bubbles in front of the diaphragm

– Remove air bubbles

– Air in the diaphragm – Extract air or moisten diaphragm

– Cable broken – Replace electrode

– Gel electrolyte dried out – Replace electrode

Cause Remedy

pH electrode:

– Diaphragm contaminated – Clean diaphragm

– Membrane contaminated – Clean membrane

– Moisture in the plug – Dry plug

– Electrolyte obsolete – Replenish electrolyte or replace electrode

– Electrode obsolete – Replace electrode

– Electrode broken – Replace electrode

Measuring instrument:

– Incorrect calibration procedure

– Select correct procedure

– Incorrect solution temperature (without temperature probe)

– Set up correct temperature

– Socket damp – Dry socket

Error message,OFLOFLOFLOFL

Error message,E3E3E3E3

57

What to do if... pH 730

Buffer solutions:

– Incorrect buffer solutions – Change calibration procedure

– Buffer solutions too old – Only use once.Note the shelf life

– Buffer solutions depleted – Change solutions

Cause Remedy

pH electrode:

– Diaphragm contaminated – Clean diaphragm

– Membrane contaminated – Clean membrane

Sample:

– pH value not stable – Measure with air excluded if necessary

– Temperature not stable – Adjust temperature if necessary

Electrode + sample:

– Conductivity too low – Use suitable electrode

– Temperature too high – Use suitable electrode

– Organic liquids – Use suitable electrode

Cause Remedy

– Calibrating interval expired

– Newly calibrate measuring system

No stablemeasured value

Sensor symbolflashes

58

pH 730 What to do if...

You would like toknow which soft-

ware version is inthe instrument

Cause Remedy

– Batteries almost depleted – Replace batteries (see section 5.1 MAINTENANCE)

Cause Remedy

– Timeout of the interface – Checkout connected instrument

Cause Remedy

pH electrode:

– pH electrode unsuitable – Use suitable electrode

– Temperature difference between buffer and sample too large

– Adjust temperature of buffers or samples

– Measuring procedure not suitable

– Follow special procedure

Cause Remedy

– Operating state undefined or EMC electric stress unallowed

– Processor reset:Press the a key and switch on instrument

LoBat display

totototo display

Obviously incorrectmeasured values

Instrument does notreact to keystroke

Cause Remedy

– e.g. question of the WTW service department

– Press the a key and switch on instrument. The software version is displayed.

Cause Remedy

– All 800 memory locations are full

– Output data store and clear data store

StoFullStoFullStoFullStoFull message

59

What to do if... pH 730

*

Cause Remedy

– Printer switched off – Switch on printer

– No mains power supply connected

– Connect mains power supply

– Interface cable connected – Unplug cable

– No paper available – Replace roll of paper

– AutoStore function is switched on with a longer interval duration (Int 1)

– Switch off AutoStore function


Cause Remedy

– AutoStore function(Int 1) or Data transmission (Int 2) is switched on

– Switch off functions

Cause Remedy

– Printer is switched on – Switch off printer

– Interface cable connected

– Unplug cable

Cause Remedy

– Paper inserted with wrong side upwards

– Turn the roll of paper around and insert it with the other side upwards

Integrated printerdoes not print *

Integrated printerprints automatically *

Print key fdoes not react *

Printer operating -paper not

being printed *

60

pH 730 Technical Data

7 Technical Data

Storage temperature - 25 °C ... + 65 °C

Operating temperature 0 °C ... + 55 °C

Allowable relative hu-midity

Annual mean: < 75 %30 days/year: 95 %Other days: 85 %

pH - 2.000 ... + 19.999- 2.00 ... + 19.99

U [mV] - 999.9 ... + 999.9- 1999 ... + 1999

T [°C] - 5.0 ... + 109.0

T [°F] + 23.0 ... + 221.0

pH(in the measuring range of 2 pH units around the calibration point)

± 0.005 (at operating temperature + 15°C ... + 35 °C)

± 0.01

U [mV] ± 0.3 (at + 15 °C ... + 35 °C)± 1

T [°C] NTC 30: ± 0.1

PT 1000:± 0.5 at 0 °C ... 15 °C ± 0.1 at 15 °C ... 35 °C± 1 at 35 °C ... 55 °C

T [°F] NTC 30: ± 0.2

PT 1000:± 0.9 at 32 °F ... 59 °F ± 0.2 at 59 °F ... 95 °F± 1.8 at 95 °F ... 131 °F

Ambienttemperature

Measuring rang-es and resolution

Accuracy(± 1 digit)

61

Technical Data pH 730

Analog output Automatic switch-over when the AK 323 recorder cable is connected.

Automatic switch-over when the AK 340/B or AK 325/S cable is connected.

Length [mm] 250

Width [mm] 300

Height [mm] 70

Weight [kg] Approx. 1.3 (without plug-in power supply)

Dimensions andweight

Output signal corresponds to electrode voltage, i. e. 50...62 mV/pH unit

Accuracy ± 0.1% of measured value ± 4mV

Internal resistanace

< 5 ohms (current limitation to max. 0.2 mA output current)

Type RS 232, data output

Baud rate can be set to 1200, 2400, 4800, 9600 Baud

Data bits 8

Stop bit 1

Parity none

Handshake RTS/CTS+Xon/Xoff

Cable length max. 15m

Serial interface

62

pH 730 Technical Data

Batteries 4 x 1.5 V AA type alkaline manganese batter-ies

Runtime Approx. 3000 operating hours

Power supply Plug-in power supply (Connection max. overvoltage category II)

Plug-in power supply unit (Euro, US, UK, Australian plug)FRIWO FW7555M/09, 15.1432Friwo Part. No. 1822089Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mAOutput: 9 V = / 1,5 A

EMC E.C. guideline 89/336/EECEN 61326-1:1997EN 61000-3-2 A14:2000EN 61000-3-3:1995FCC Class A

Instrument safety E.C. guideline 73/23/EEC

Protective class 3, EN 61010-1 A2:1995

Climatic class 2, VDI/VDE 3540

UL/CUL, CE

Energy supply

Guidelinesand norms used

Test marks

63

Technical Data pH 730

FCC Class A Equipment Statement

Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

64

pH 730 Lists

8 Lists

This chapter provides additional information and orientation aids.

Abbreviations The list of abbreviations explains abbreviations that appear on the display or when dealing with the instrument.

Specialist terms The glossary briefly explains the meaning of the specialist terms. However, terms that should already be familiar to the target group are not described here.

Index The index helps you find the topics that you are looking for.

65

Lists pH 730

Abbreviations

AR AutoRead (drift control)

ARng Automatic range switchingMeasuring instrument measures with high-est resolution

ASY Asymmetry

AutoCal DIN Automatic calibration with DIN buffer solutions

AutoCal TEC Automatic calibration with WTW technical buffer solutions

Cal Calibration

Cd... Calibration withDIN buffer solutions (acc. to DIN 19 266)

ConCal Conventional one/two point calibration

Ct... Calibration withWTW technical buffer solutions

disp Display Displays the data storage on the screen

E3 Error message (see WHAT TO DO IF ...)

InI InitializationResets individual basic functions to the status they had on delivery

LoBat Low BatteryBatteries are almost empty

mV Voltage unit

mV/pH Unit of the electrode slope

OFL OverflowDisplay range exceeded

pH pH value

RCL Recallmemory dump

66

pH 730 Lists

S Slope

SELV Safety Extra Low Voltage

SEr Serial interfaceOutput of the data storage on the RS 232 or on the internal printer

SLO SlopeSlope setting on calibration

Sto Store Memory

TP Temperature probeTemperature measurement active

UASY Asymmetry potential

°C Temperature unit, °Celsius

°F Temperature unit, °Fahrenheit

67

Lists pH 730

Glossary

Asymmetry Zero point of a pH electrode.

Resolution Number of decimal places that appear for a measured val-ue.

AutoRead Monitors the electrode drift and releases the measured val-ue only after the stability criterion has been reached. In this way, this procedure ensures the highest degree of precision and reproducibility.

Baud rate Transmission rate in bits/s.

Diaphragm Contact point between the reference electrolytic solution and the sample.

Drift control See AUTOREAD.

MultiCal® Group term for the various WTW calibration procedures used for automatic calibration in buffer solutions.

Test sample Sample to be measured (can be liquid or solid).

Test solution Stable solution with a precisely known Redox voltage.

Buffer solution Stable solution with a precisely known pH value.

Redox voltage Potentiometric quantity.

Slope Specifies the voltage change per pH unit.

68

pH 730 Lists

Index

Aanalog output . . . . . . . . . . . . . . . . . 44asymmetry . . . . . . . . . . . . . . . . . . . 21authorized use . . . . . . . . . . . . . . . . 10AutoCal DIN . . . . . . . . . . . . . . . 21, 28AutoCal TEC . . . . . . . . . . . . . . . 21, 25AutoRead . . . . . . . . . . . . . . . . . . . . 18

Bbatteries

replacing . . . . . . . . . . . . . . . . . . 53battery compartment . . . . . . . . . . . . 54baud rate

setting . . . . . . . . . . . . . . . . . . . . 48

Ccalibrating . . . . . . . . . . . . . . . . . . . . 21calibration

evaluation . . . . . . . . . . . . . . . . . . 23interval . . . . . . . . . . . . . . . . . . . . 24procedures . . . . . . . . . . . . . . . . . 21protocol . . . . . . . . . . . . . . . . . . . 22

ConCal . . . . . . . . . . . . . . . . . . . 21, 31condition on delivery . . . . . . . . . . . . 51

Ddata record . . . . . . . . . . . . . . . . . . . 34data transmission (interval) . . . . . . . 43date

setting . . . . . . . . . . . . . . . . . 13, 49display . . . . . . . . . . . . . . . . . . . . . . . . 7drift control . . . . . . . . . . . . . . . . . . . 18

Eenergy saving feature . . . . . . . . . . . 15error messages . . . . . . . . . . . . . . . . 57

Iinitial commissioning . . . . . . . . . . . 13initialize . . . . . . . . . . . . . . . . . . . . . . 51interval

calibration . . . . . . . . . . . . . . . . . 24data transmission . . . . . . . . . . . 42storing . . . . . . . . . . . . . . . . . . . . 36

Kkeys . . . . . . . . . . . . . . . . . . . . . . . . . 6

LLoBat . . . . . . . . . . . . . . . . . . . . . . . 59

Mmeasuring precision . . . . . . . . . . . . 24MultiLab pilot . . . . . . . . . . . . . . . . . 46

Ooperational safety . . . . . . . . . . . . . . 10

Ppaper roll

replacing . . . . . . . . . . . . . . . . . . 53place of the instrument . . . . . . . . . . 15plug-in power supply

connecting . . . . . . . . . . . . . . . . . 14printing

calibration protocol . . . . . . . . . . 22measured values . . . . . . . . . . . . 20

printing measured values . . . . . . . . 20

RRedox electrode . . . . . . . . . . . . . . . 19Redox voltage . . . . . . . . . . . . . . . . 19reset . . . . . . . . . . . . . . . . . . . . . . . . 51RS232 interface . . . . . . . . . . . . . . . 45

69

Lists pH 730

Ssafety . . . . . . . . . . . . . . . . . . . . . . . . .9safety precautions . . . . . . . . . . . . . . .9scope of delivery . . . . . . . . . . . . . . .13single-point calibration . . . . . . . . . . .21

ConCal . . . . . . . . . . . . . . . . . . . .33slope . . . . . . . . . . . . . . . . . . . . . . . .21sockets . . . . . . . . . . . . . . . . . . . . . . .7

Ttemperature probe . . . . . . . . . . . . . .17three-point calibration . . . . . . . . . . .21

AutoCal DIN . . . . . . . . . . . . . . . .30AutoCal TEC . . . . . . . . . . . . . . .27

timesetting . . . . . . . . . . . . . . . . . . 13, 49

two-point calibration . . . . . . . . . . . .21AutoCal DIN . . . . . . . . . . . . . . . .29AutoCal TEC . . . . . . . . . . . . . . .26ConCal . . . . . . . . . . . . . . . . . . . .31

70

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Manual de pH Metro

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